<!DOCTYPE HTML>
<html>
<head>
  <title>Test overdraw</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<script type="application/javascript">
var domWindowUtils = SpecialPowers.getDOMWindowUtils(window);

var overdraw = domWindowUtils.requestCompositorProperty("overdraw");

if (overdraw == -1) {
  // Overdraw queries are not supported on non OMTC builds.
  ok(overdraw == -1, "Platform doesn't use a compositor.");
} else {
  // Overdraw may be lower than 100% like on OS X where we don't
  // composite the window corners.
  ok(overdraw > 0.95 && overdraw < 200, "Overdraw: " + overdraw);
}
</script>
</body>
